isogram

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isogram

Where it comes from

From iso- + -gram. The "contour line" sense was proposed in 1889 by Francis Galton.

noun isograms

A word in which no letter of the alphabet occurs more than once. For convenience, we can refer to an isogram of order n as an n-isogram. The examples in (2a) are 1-isograms, (2b) 2-isograms, and (2c) 3-isograms. Second- and third-order isograms are also sometimes referred to as pair and trio isograms respectively, but I will not use these terms here.
A line on a map or chart, such as a contour line, joining points that have the same value for some quantity.
Similar: isoline, isopleth, isarithm

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MLA

"isogram." Wiktionary, via Micwyn, micwyn.com/word/isogram. Accessed 6 Nov. 2026.

APA

isogram. (n.d.). In Wiktionary, via Micwyn. Retrieved November 6, 2026, from https://micwyn.com/word/isogram

Chicago

"isogram." Wiktionary, via Micwyn. Accessed November 6, 2026. https://micwyn.com/word/isogram.

BibTeX

@misc{isogram_2026,
  title = {isogram},
  howpublished = {Wiktionary, via Micwyn},
  year = {2026},
  url = {https://micwyn.com/word/isogram},
  urldate = {2026-11-06}
}